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Old Sep 1, 2006, 7:00 PM   #1
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Greetings. Base on other forum feed back, I may get a 70-200 f/4 L len with an extender to get that the 100-300 range I am looking for in a telephoto len. I need your experiences on what extenders work without damaging the camera and len. In addition if you can tell how well an extender with a 70-200/L works with moving objects such as horses, birdsor other wildlife would be appreciated.



Thank You in Advance!

Tony
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Old Sep 2, 2006, 6:13 AM   #2
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lassen1 wrote:
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Greetings. Base on other forum feed back, I may get a 70-200 f/4 L len with an extender to get that the 100-300 range I am looking for in a telephoto len...
Why don't you get a 100-300 lens in the 1st place?

Don't get me wrong the 70-200 f/4L is excellent and cheap for an L lens, but then if you already know up front you'll be needing 100-300 which means you're going to use it with a 1.4x teleconverter (BTW any teleconverter will work here) most of the time - then why not get the right lens right off the bat?
How much is the 70-200 with the Canon 1,4x TC?
IMO that combo cost put it in the same ballpark as the Sigma 100-300 f/4 EX which is one of the sharpest lens they make!

Check it out for yourself, here's the measured MTF's of the EF 70-200 f/4L with a 1.4x teleconverter (280mm @ f/5.6):
http://www.photozone.de/8Reviews/len...00_4/index.htm

and here's the MTF's for the Sigma 100-300 f/4 EX:
http://www.photozone.de/8Reviews/len...00_4/index.htm

The EX's are Sigma high-line with HSM (i.e. similar to USM); However, you are getting a 300mm @ f/4 which is not only sharper, but a stop faster than the 280mm f/5.6, 1.4xTC Canon combo.
-> As a bonus with the f/4 Sigma you can still use the 100-300 EX with a 1.4x and get a 420mm f/5.6 reach which is actually sharper than my 100-400L f/5.6L !!!
Again double check it: http://www.photozone.de/8Reviews/len...6_is/index.htm :idea:
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Old Sep 2, 2006, 12:56 PM   #3
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NHL:

Thank You for your help. I recently purchased my second Digital Camera, my first dSLR and have been looking at upgrading the current lens. I recently completed a trip to Alaska and took some wonderful pics with my Canon 70-300 III USM but many pics were soft focusin the 200-300 end even on a monopod. So I am looking for to upgrade.

In your experience with the Sigma, do you get many blurry shots in outdoor conditions on objects in motion such as a horse at 200-300 or even w/ TC at 420?

Thank You again.

Tony


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Old Sep 2, 2006, 5:59 PM   #4
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lassen1 wrote:
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In your experience with the Sigma, do you get many blurry shots in outdoor conditions on objects in motion such as a horse at 200-300 or even w/ TC at 420?
IMO I get more blurry shot when the camera is in AI-servo than in one-shot AF

One-shot AF is focus-priority (i.e. you can't release the shutter unless at least one of the AF point is in focus) whereas the AI-servo mode actually put the camera in shutter-priority (try putting a lens cap on your lens and the shutter will release anyway without anything in focus) - Just try it!

Also I only use the center AF point which is more precise since most of my lenses are f/2.8 which will automatically enable the camera high precision mode. My lens is actually the Sigma 120-300 f/2.8 EX which is not as sharp as the 100-300 f/4 EX.

As to using the TC I don't shoot horse, but birds in flight, with quite a busy background (+ 1.4x TC):






... and with a 2x teleconverter (@ 600mm):


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Old Sep 5, 2006, 2:44 PM   #5
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NHL:



Thank You for the nice pics. Exactly what I neededto see from the Sigma 100-300. I amgoing to try out the Sigma 100-300.

Thank You for yourhelp.
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